Trouble Importing Tkinter in embedded C program

[Rick Olson]

I'm trying to add a Tkinter interface to an existing C program with
embedded python, but seem to have trouble importing Tkinter (or
accessing it).  I tried a simple program that would run the script
"hello.py"
This is hello.py:

from Tkinter import *
mainWindow=Tk()
label=Label(mainWindow, text="Hello")
label.grid(row=0,column=0)
mainloop()

My first attempt at embedding this in C was:

#include <Python.h>
#include <stdio.h>

int main(int argc, char *argv[])
{
    Py_Initialize();
    PySys_SetPath(".");

    FILE *fp=fopen("hello.py","r++");
    PyRun_SimpleFile(fp,"hello.py");
    Py_Finalize();
}
 
On execution I was told:
Traceback (most recent call last):
  File "hello.py", line 1, in ?
    from Tkinter import *
ImportError: No module named Tkinter

Using Py_GetPath reported:

/usr/lib/python2.2/:/usr/lib/python2.2/plat-linux2:/usr/lib/python2.2/lib-tk:
/usr/lib/python2.2/lib-dynload

On my SuSE 8.2 installation Tkinter.py is in usr/lib/python2.2/lib-tk/

So I tried to explicitly load the Tkinter module in the program by
inserting the following right after the SetPath:

    PyObject *importModule = PyImport_ImportModule("Tkinter");
    if (importModule == NULL)
    { printf(" Tkinter import unsuccessful\n");
      return 1;
    }

When I run this, importModule is coming back as NULL.

Can someone guide me in the right direction to allow calls to Tkinter
through the embedded python?  I know there are ways of using Tk/Tcl
through C, but I'm not familiar enough with Tk/Tcl to try that.

Thanks in advance--
Rick Olson